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PCI-e 4.0 and 3.0 "conversion"

I just have the most peculiar question which it that, Can't technically 1x bandwidth of PCI-e 4.0 be converted into 2x PCI-e 3.0 ? Meaning if CPU has 20x PCI-e 4.0 lanes, can't it be that 16x PCI-e 4.0 would be used for GPU and the rest of bandwidth be converted into 8x PCI-e 3.0 on other slots?

 

Thanks for every response,

A.

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5 minutes ago, Adamator_Cz said:

I just have the most peculiar question which it that, Can't technically 1x bandwidth of PCI-e 4.0 be converted into 2x PCI-e 3.0 ? Meaning if CPU has 20x PCI-e 4.0 lanes, can't it be that 16x PCI-e 4.0 would be used for GPU and the rest of bandwidth be converted into 8x PCI-e 3.0 on other slots?

 

Thanks for every response,

A.

It should be possible but you need aditional hardware for that, it won't be done by your motherboard automatically.

So for example, if you have a PCI-e 3.0 x16 card running it PCI-e 4.0 x8 slot, the card will run at PCI-e 3.0 x8 speed, so you need some kind of extension card (there are some for NVME SSD) that also have some kind of controller to split the bandwidth. Not sure if there are any for the graphic cards.

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In theory, yes. I haven't heard of any consumer PCIe 4 devices or motherboards that support this, though, and I'm not sure if it will ever become common. The Liqid Honeybadger effectively does this. It takes 16 Gen 4 lanes and uses that bandwidth for 8x4 PCIe Gen 3 drives (32 lanes).

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This is pretty much what the PCH (chipset) partially does. Connection to CPU on one side, a lot of connections on the other, PCH handling all the traffic so everyone goes through fairly like a traffic intersection. It's just not necessarily the configuration you want.

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: 1TB HP EX920 PCIe x4 M.2 SSD + 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172), 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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